Signaling device for telegraph systems



Dec. 8, 1931. R. s. WISHART 1,835,549

SIGNALING DEVICE FOR TELEGRAPH SYSTEMS Filed April 10, 1930 INVENTCR RONALD s. WISHART BYZW ATTORNEY Patented Dec. 8, 1931 UNITED STATES PAT NT oFFICE RONALD S. WISHART, OF ROOKVILLE CENTER, NEW YORK, ASSIGNOB 'IO POSTAL TELE- GRAPH-CABLE COMPANY, OF NEW YORK, N. Y., CORPORATION OF NEW YORK V SIGNALING DEVICE FOR TELEGRAPH sxsr'nns Application filed April 10,

This invention relates to printing telegraph systems and more particularly to a type of auxiliary signal for use therewith.

1n printing telegraph systems there are times when traffic is such that an operator is not needed at each printer in a station, therefore it has been found necessaryto provide a signal which will call attention when an operator at a distant station desires to transmit.

It is therefore the principal object of this invention to provide a signal which may be simply operated by a distant operator to designate to an attendant the printer through which it is desired to transmit.

A further object is to provide a signal which will only operate during periods of light load and not under conditions of regular traflic.

A more clear conception of the details, operation and further objects of the invention may be had from the following description taken in conjunction with the accompanying drawing which discloses the signal circuit connected to a printer, a portion of which is shown in detail.

A portion of upper bar of the type basket 2 with one side of the frame 3 of a printing mechanism is shown. Secured to the under side of bar 2 is a brace 4 having a lug 5 secured thereto. Secured to the side of frame 3 is an L-shaped bracket 6 having a pair of contacts 7 and 8 secured thereto. Flexible leads 9 and 10 connect these contacts to terminal clips 11 and 12 of the printer.

The operating circuit for the signal lamp 1 1 is connected to clips 11 and 12 and includes a slow operating relay 15.

During periods of light traffic when the printer is unattended and a distant operator desires to communicate over the printer a shift signal is transmitted which shifts the type carriage to the upper case. At this time the upward movement of the type basket raises the brace 1 which closes contacts 7 and 8 by means of lug 5. This closes a circuit from battery 16, resistance 17, conductor 18, clip 11, lead 9, contacts 7 and 8, lead 10, clip 12, conductor 19 through the winding of relay 15 to ground.

1930. Serial No. 443,105.

The operation of relay 15 closes a circuit while in normal operation. That is, if the 7 type basket is raised an average maximum of eight seconds during normal operation, relay 15 is adjusted to remain unoperated with full current for ten seconds. viates the lighting of the lamp during normal operation of the printer. 7

The operation of a letter key at the distantstation releases the type basket restoring the relay to normal and extinguishing-the lamp 1 1. The signal may-be also extinguished by operating shift release button 21 which operates bell crank 22 releasing the catch 23 thereby releasing the basket from the shifted position and restoring the circuit to normal.

What is claimed is:

1. In a printing telegraph mechanism, a type basket, a shift mechanism for said basket, means for operating a signal when said basket remains in a shifted position beyond a predetermined time limit.

2. In combination, a type basket, a slow operating relay, a signal circuit under control of said relay, a shifting mechanism for said basket and means secured to said basket operative upon the shifting of said basket for operating said relay.

3..In a printing telegraph mechanism, a

type basket, a shift mechanism for said basket, a pair of contacts associated with said basket and adapted to be closed by the shift ing of said basket, a slow operating relay controlled by said contacts and a signal adapted to be operated by said relay when said basket remains shifted beyond a predetermined time limit.

4. In a printing telegraph mechanism, a-

This obtype basket, a shift mechanism for said basket, a pair of contacts associated with said basket and adapted to be closed by the shifting of said basket, and a signal adapted to 5 be operated by said contacts when said basket remains shifted beyond a predetermined time limit.

6. In combination, a type basket, a. slow operating relay, a lamp circuit under control of said relay, a shifting mechanism for said basket and means for operating said relay secured to said basket operative upon the shifting of said basket.

7. In a printing telegraph mechanism, a type basket, a lug thereon, a shift mechanism for said basket, a pair of contacts adapted to be closed by said lug when said basket is shifted, a slow operating relay controlled by said contacts and a signal adapted to be operated by said relay when said basket re-- mains shifted beyond a predetermined time limit.

8. Auxiliary signaling method for use with printing telegraphs, comprising an electrical circuit closed When the type basket is raised to the shift position and which includes a slow energizing relay rendered operable only by current maintained for a period in excess of that requiredfor transmitting normal code combinations, a second electrical circuit operated by the slow energizing relay and a signaling device in said second circuits.

9. In a printing telegraph mechanism, a type basket, a shift mechanism for said has ket, a pair of contacts associated with said basket and adapted to be closed by the shifting of said basket, a slow operating relay controlled by said contacts, a signal adapted to be, operated by said relay when said basket remains shifted beyond a predetermined time limit and means for manually releasing said signal.

10. In combination an electrical circuit 4 normally closed at intervals for a definite limited period, means for operating said circuit at will, a slow energizing relay in said circuit operable only on application of current for a period in excess of the normal, a second circuit operated by said relay, asignaling device in said second circuit and means for manually releasing said relay.

11. In a printing telegraph mechanism, a type basket, a shift mechanism for said hasket, means for giving a signal when said basket remains in a shifted position beyond a predetermined time limit and a button for manually releasin said basket.

In witness whereo I hereunto subscribe 6 my name this 9th day of April, 1980.

RONALD S. WISHART. 

